Spark-plug



F. ROBINSON.

SPARK PLUG. APPLICATION HLED JULY I5. 2916 Patented May 20, 1919.

'- of spark plug in which the parts are so arof a gland into the chambered core and having a ba fouling of the ignition FRANK BOBINSUN, OF CHICAGO. ILLIN 01S.

SPARK-PLUG.

Application filed 51115; 15, 1916. 4 Serial No.

To-all whom i may concern;

Be it known that I, FRANK ROBINSON, a

ment of the plug from the United States, and a resident Chicago, in the county of citizen of of the city Cook and State of Illinois, have invented certain new and useful Improvements in Spark-Plugs; and I do hereby the following is a full, clear, and exact description of-the same reference being had to the accompanying drawings, and to the numerals of reference form a part of this specification.

This invention relates to an improved type ranged and constructed that the plug 18 practically self cleaning, and furthermore permits a ready removal of the parts liable to become fouled or damaged without necessitating complete detachment of the entire plug from the engine cylinder in which it is connected. I

It is an object of this invention to construct a spark plug for internal combustion engines 'constructed to keep its terminals clean from fouling-materials.

It is also an object of this invention to construct a spark plug consisting of a tubular insulating core having a combustion chamber therein .into which projects a feed wire on which a ba e 'plate is mounted to prevent the terminal of said feed wire from becoming fouled.

It is a further object of this invention. to construct a spark plug consisting of an apertured sleeve for receiving a chambered'insulating core removably held in place by means threaded into said sleeve, said sleeve provided with a conductor projecting e plate near the terminal end thereof to prevent fouling materials from entering said chamber thus. keeping the terminal clean.

It is furthermore an important object of this invention to provide a spark plug comprising a chambered tubular insulating core having a priming tube therein for connecting a priming cup and a feed wire with said chamber, said core being removablv mounted in a sleeve having a second feed wire projecting upwardly therein into said chamber to a point opposite the terminal end of said priming tube and having means mounted near the terminal end thereof to pre'vent terminals.

It is-finally an object of this invention to construct airimproved spark plug consist- Specifieation of Letters Patent.

declare that marked thereon, which upon Patented May so, rare. lillhfii).

ing of few parts readily taken apart for repairs without necessitat ng entire detachthe engine cylinder,

and provided with a means for preventing fouling of the ignition terminals of the plug.

The invention (in a preferred form) is illustrated'in the drawings and'hereinafter more fully described.

In the drawings:

Figure 1,. is a side elevational. View of a spark plug embodying the principles of my invention.

Fig. 2, is a central vertical section taken through the spark plug with parts shown in elevation.

Fig. 3, is a top planiview"ofl'the spar .plug.

Fig. 4c, is a section talienon line 4l'-:l-,' of Fig. 2.

Fig. 5, is a section taken es line 5-5, of Fig. 2. v

Fig. 6, is a section takenjonline 6-ii, of Fig.2.

Fig. 7, is a central vertical section of the upper end of a modified form of spark plug.

As shown in the drawings: v

The upper end of an internal combustion engine cylinder or a removable plug therein. is indicated by the reference numeral 1, and threaded into a suitable aperture therein, and provided with a copper asbestos gasket 2, is sleeve comprising an externally threaded plug 3, having integrally formed thereon-a hexagonal portion 4. affording a nut to receive a wrench engaged therewith to tighten said sleeve in sealing relation with the cylinder 1. lntegrallyformed on said hexagonal portion 4, is a cylindrical shell or upper casing 5, internally threaded at its end, and provided in its side walls u'th a plurality of small ventilating or cooling'apertures 6.

Fitting within said a suitable packing 7. is a relatively long tubular core 8. of porcelain or other suitable insulating material having an en larged portion 9, at the lbwer end thereof which fits snugly against he inner wallsof said shell Said enlarg d portion has formed therein a combustion chamber l0, which conmmnicate with a passagcll. a3;-

shell 5, and bearing iallv formed through said plug 3 "and with said hexagonal portion Au airi'al passage communicating with the upper end of saidchamber 10, S, and pro ecting therethrough a priming is also formed in said core said core and further aflording tube 12, the'lower end of which projects into said combustion chamber grally to contact the walls of said chamber to prevent the tube from being drawn through a suitable anchor or catch to permit said tube to be clearly shown in Fig. 2.

locked in sealing relation with the core by the l'ock'nuts ll, engaged on the upper threaded end of said tube which projects beyond the upper end of the core 8, as Threaded on the upper end of said tube 12, and communicatshell 5, and presses against I 20,-re'st1ng on the upper end ot the ei'ilarged POI'lZlOlI 9, of the core to clamp the same 111 jplace-sealed and properly alined withinthe 16, and with a binding post 17,

ing with the interior thereof is a priming 15 cup 15, provided with an insulated handle for attaching an lgnition wire or conductor 18. to the To removably hold said core 8, in position Within. said shell 5, a threaded-gland or lock nut 19, isthreaded into the. upper end of the a packing gasket ot' the tube 12, forming ignition terminals -;for the spark plug. The battle plate "vents oil or other fouling elements resulting 22, prefrom cylinder explosions: from passing upwardly through the passage 11, into the upper end of the combustion chamber 10, to thus foul the ignition terminals of the spark plug. To prevent the enlarged portion 9, of the core 8, from becoming too hot the apertures 6, are provided, as already described,

to venti ate and permit cooling of said core. In the modified form vot snark pl ug shown in Fig. 7, the construction 01' the device 1s identical with that already described, eX-

cept that the priming mechanism is omitted and replaced by a cap 24, threaded on the upper end of the tube 12, clamping a conductor25. in position against the lock nuts 14. Priming in this case is performed by removing the cap 2%, and supplying the priming liquid through the tube 12.

From the construction of the spark plug it. will of course be seen that the various parts may be removed or replaced without necessitating the removal of the entire plug from the engine to which it is attached. I am also aware that various-details of the and has inteformed thereon a flange 13, adapt-ed 22, of a diameter equal to the' said combustion chamber to construction mayfbe varied through a wide range without departing from the principles.

of this invention, and I therefore do not pur-' pose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1; In a spark plug of the class described,

a sleeve. member adapted to be threaded into the wall of the combustion chamber of an engine, an insulating core removably mounted therein, said insulating core having a combustion chamber therein larger than the passage in the sleeve, a spark terminal projecting into said enlarged chamber, a second spark terminal in said sleeve projecting upwardly into said enlarged chamber to a point below said first mentioned terminal, and

core passage projecting into said combustion.

chamber to afford a terminal, priming means connected on the upper end of said tube, a feed wire connected thereto, a second feed wire connected to said sleeve and projecting keep said termiupwardly through said sleeve passage into afford a second terminal, with I battle means removably mounted'on said second terminal; Within said combustion chamber to rials resulting from explosions from entering the combustionchamber to foul said terminals. v

3. In a device of the class described, an apertured sleeve having a passage therein, a passaged insulating core therein, an enlarged portion integrally formed on said core having a combustion chamber tlierein,priining meansrem'ovably mounted on said core and projecting into said combustion chamber to afi'ord a-terminal, mechanism connected With said sleeve and; projecting through the passage therein into said combustion chamber to afiord a second terminal, and means thread.- ed into said sleeve to contact said enlarged core portion to sealingly hold said core in position, said mechanism adapted to keep said terminals clean.

4. A spark plug comprisinga sleeve, an

insulating member secured thereto having a chamber therein largenthan the bore of said sleeve, conductors pro ecting .lnto saidaenlarge'd chamber, and a baffle plate in said chamberonone of said conductors below the deflect fouling mate F. ROBINSON.

SPARK PLUG. APPLICATION FILED JULY I5. 1916 Patented May 20, 1919. 

